Don't want to be rude but I'm getting really fed up with the state = bad mindset that's now becoming a dogma. State is there to be used appropriately. There's nothing wrong with state, gotos or whatever, and there's nothing right about functional or OO. It's how you use them.
In this instance, I'm pretty confident the generator version is just a better phrasing. It's shorter, contains no mutable state to get wrong, is Pythonic, and can instantly be made lazy by replacing the square brackets with round ones.
`[p for p in permutations(numbers) if primePairs(p)]`
